Compare flights on this travel earch engine site. Kayak was started by founders of Orbitz, Travelocity and Expedia. It searches hundreds of travel sites from all over the world, provides the information and sends you directly to the source to make your purchase.

This is not a comparison site but it a useful yardstick for you as you do your ticket research. Thompson have a good range of low cost holiday flights from regional airports. However this site has all their holidays so you might end up not flying!